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並前往https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/variance-standard-deviation-population/v/range-variance-and-standard-deviation-as-measures-of-dispersion

Measures of spread: range, variance & standard deviation

So the symbol for the variance -- and we're going to deal with the population variance. Once again, we're assuming that this is all of the data for our whole ...

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